使用單位增益緩沖器構(gòu)成的抗寄生SC跨導(dǎo)
PARASITIC TOLERANT DIFFERENTIAL SC TRANSCONDUCTANCE USING UNITY GAIN BUFFERS
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摘要: 用單位增益緩沖器構(gòu)成的開(kāi)關(guān)電容濾波器(SCF),若能消除寄生電容引起的阻性寄生,則可用于高頻設(shè)計(jì),總寄生靈敏度會(huì)因此大大降低。本文在此基礎(chǔ)上提出一種新的抗寄生開(kāi)關(guān)電容(SC)跨導(dǎo)元件電路差分跨導(dǎo)元件,并用它構(gòu)成了適用于高頻的SC浮地電感和積分器。最后用它實(shí)現(xiàn)了一個(gè)三階橢圓函數(shù)低通濾波器,并經(jīng)計(jì)算機(jī)模擬和實(shí)驗(yàn)驗(yàn)證,證明了該方案的正確性。Abstract: The unity gain buffer will be good for designing high frequency SCF if its resistive effect can be eliminated and then the overall parasitic sensitivity will be greatly lowered. Based on this concept, a new parasitic tolerant SC differential transconductance element (DTE) is proposed. SC floating inductor and integrator applicable to high frequency are formed by using the DTE. The computer simulation and experiment on a 3-order elliptic LP filter show the correctness of the concept.
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